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3 years ago

25% of what number is 12

Mathematics

2 answers:

ira [324]3 years ago

6 0

Just do 12 times 4 this should get you 48 and thats the number

galben [10]3 years ago

5 0

To solve for x, set up an equation like below...
.25(x) = 12
Divide by .25 from both sides and you get...
x = 48

Check..
.25(48) ?= 12
12 = 12

We did it! :D

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When the factors of a trinomial are (x + p) and (x + q) then the constant term

nirvana33 [79]

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3 years ago

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Following PEMDAS

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3 years ago

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3 years ago

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2 years ago

Solve y=-3x² + 4.5x – 20<br> Use the Quadratic formula

statuscvo [17]

Answer:

$x=0.75 \pm 2.47067i$

Step-by-step explanation:

Quadratic Formula: $x=\frac{-b \pm \sqrt{b^2-4ac} }{2a}$

√-1 is imaginary number i

Step 1: Define

y = -3x² + 4.5x - 20

a = -3

b = 4.5

c = -20

Step 2: Substitute and Evaluate

$x=\frac{-4.5 \pm \sqrt{4.5^2-4(-3)(-20)} }{2(-3)}$

$x=\frac{-4.5 \pm \sqrt{20.25-240} }{-6}$

$x=\frac{-4.5 \pm \sqrt{-219.75} }{-6}$

$x=\frac{-4.5 \pm \sqrt{219.75}(\sqrt{-1} ) }{-6}$

$x=\frac{-4.5 \pm i\sqrt{219.75} }{-6}$

$x=\frac{4.5 \pm i14.824 }{6}$

$x=0.75 \pm 2.47067i$

7 0

3 years ago